Work holder



Nov. 20, 1928.

J. L. PERKINS ET AL WORK HOLDER original Filed Jan- 9, 1926 FIG. 4

A TTORNE Y.

Patented Nov. 20, 1928.

UNITED STATES PATENT oFFicE,

JULIAN L. PERKINS, OF WEST SPRINGFIELD, HIRAM I). CROFT, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNORS, BY MESNE ASSIGNMENTS, T0 PERKINS `1VIACHINE AND GEAR COMPANY, OF SPRINGFIELD, MASSACHUSETTS, A CORPORATION 0F MASSACHUSETTS.

WORK HOLDER. f

Originalvapplication kled January 9, 1926', Serial No. 80,326. Divided and this application filed August 17,

Our invention relates to improvements in devices or appliances for holding work, suoli as hinge leaves, for example, in place while being cut, ,faced ofi, or machined, and consists essentially of a carrier, a female clamping block, a bearing bloc r and a male elan'iping block in said female clamping block, a screw for operating said male clamping block, a liand-wlieel mounted on said screw, and means to enable said hand-wheel to impart a hammer blowv to said screw, all peculiarly constructed, arranged, and combined, together with such other parts and members as may be necessary or desirable in order to render the appliance or holder complete Vand serviceable in every respect, as hereinafter set forth in detail.

This work holder is a division of our application for U. S. patent on breaching machines filed January 9, 1926. Serial No. 80,326, patented Sept. 13, 1927, Patent No. 1,642,593. y l

The primary object of our invention is to provide for a machine, such as that which forms the subject of the aforesaid application, comparatively simple, convenientand easily operated, strong and durable, and withal highly efficientmeans to clamp and hold securely in place the work while being acted on by the cutting or breaching elements of said machine.

Another object is to produce a work holder, of this character which can readily be taken apart, and the parts of which can as readily be assembled. This is important because, for different kinds and sizes of work, it is neces` sary to change the clamping means of the holder to nieet the varying conditions incident to the variation in the work.-

A further object is to afford means iniparting a final impact to the clampingscrew in tightening the same, and thus to insure against possible slipping ofthe work iu the holder, and for starting said screw when tightened, without, in either case expending or exerting a great amount of manual force.

Other objects and advantages will appear inthe course of the following description.

We attain the obj ects and secure the advantages ofour invention by the mechanism illustrated in the accompanying drawings, 1n whichv beyond the former.

Serial No. 129,701.

Figure 1 is a top plan of a work holder which embodies a practical form of our invention; Fig. 2, a front elevation of a piece of work adapted to be received and clamped insaid holder; F ig. 3, a central, vertical section'through the holder, taken on the plane of the hand-wheel axis, and, F ig. 4, affront elevation ofthe work holder. Y i Similar reference characters designate similar parts throughout the several views.

In the present example, the work holder is shown mounted on a roclr shaft, as 1, inasmuch as it is necessary that the holder oscillate in the breaching machine hereinbefore referred to, but it is to be understood Vthat the holder might be mounted for reciprocation into and out of operative position relative to the cutting elements of the machine in which the holder is embodied, and it is conceivable that the holder might be used always in a stationary position, that is to say, without being either oscillated or reciprocated.

The work holder illustrated in connection herewith is described as follows:

A carrier 2 has a rectangular opening 3 extending tlirough the same from front to back. Fitting within the opening 3,and secured thereto by means of two bolts 4, is a female clamping block 5. The block is bifurcated to form upper and under arms or extensions, and at the rea-r end inside is shaped to receive and support the convex side of a hinge leaf 6, the side edges of which leaf are to be breached or faced off. The block 5 is narrower than the leaf 6, in order to enable the latter to project at both longitudinal edges The free rends of the clamping-block arms are directed forwardly, the lowerarm rests on the bottom of the opening 3, and the bolts 4, which are tapped into and through the top of the carrier 2,are.

screwed down tightly onto the top of the upper arm. A male clamping block 7 is slidingly located in` thefemale clamping block 5,

and adapted by position and construction to engage from the front the leafr 6 and hold the same in position in said female clamping block the rear end of said male clamping *blockA being shaped lto engage the concave side of said leaf. The block 7 does not project from the block 5.

As meansl for forcingthe block 7 tightly lfi against the leafi and withdrawingsaid block from clamping position, a bearing block 8 and a screw 9 provided with a hand-wheel 10 are employed. In the inner sides of the female clampngfblock arms are two transverse slots l1. The bearing block 8 fits between the arms of the block 5, and on the top and bottom of said bearing block are transverse ribs 12-12 which lit within the slots 11. By this means and in this manner the block S is held against displacement either forwardly or rearwardly in the block 5, and said block 8 is held against displacement laterally by the sides of the opening 3. The clamping block 7 also held against lateral displacement by the sides of the opening 3. The screw 9 1s tapped intel and through the bearing block 8, and has at` the rear end an enlargement or nut 13 ilu-it is received in a recess 14'in theclanl )ing block 7, such recess beingin the center of the front side of said clamping block, whereby the lat ter islnoved forwardly or rearwardly by said nut, when said screw is rotated and according to the direction of rotation. v

Atithe outer terminal of the. screw 9 is a square head 15, and the hand-wheel 1() has a square opening16 inthe hub thereof, which opening is slightly larger than said head. The head 15 is received in the opening 16', and a checkmut 17 is screwed onto a screw-threaded projection 18 at the extreme front end of the screw 9, to retainithe handwvheel 10 in place on said head. The check-nut 17 pre vents the hand-wheel 10 from being withdrawn from the head 15 in a` forward direc tion, and a flange 19 on the screw 9 behind said head prevents said handfwheel from moving rearwardly on said head. j In aembling the parts 'and members of this work holder, the bearing-block 8` is laterally inserted in place in the female clamp,- ing block 5, the latter is inserted in the opening, the screw 9 is introduced into said bearing block, said clamping block is positioned rearwardly in the carrier 2 far enough to enable themale clamping block 7 toghe laterally inserted in said female clamping block, when the nut 13 is received in the opening or slot 14C` prepared for the same in said male clamping block, which slot extends through from side to side of the latter block and opens through the front end thereof, and finally the female clamping block is drawn forwardly to the required extent in said carrier and secured by means of the bolts 4. The final position of the block 5 in the carrier 2 is such as will enable the work to be inserted, back of' said carrier, between the two clamping blocks. It is assumed that the hand-wheel 10 has been mounted on the head 15,'an`d the check-nut 17 screwed onto the projection 18.

When the screw 9 is rotated in one direction, it moves rearwardly or inwardly and carries with it the male clamping block 7, which slides in the space between the arms ofthe female clampingibitch` 5', and, when said screw is rotated in the other direction, it moves forwardly or outwardly and carries with it said male clamping block; When `the block 7` is moved forwardly by the screw 9 far enough to receive the leaf 6 inthe space between the back end of said block and the adjacent surface of the block 5, said leaf is inserted sideways into such space, and the-n said screw is rotated in the direction tio-force said block 7 rearwardly into clamp-ing engagement with said leaf. As already noted, the leaf is wider than either thc block 5 or'the said firstsnamed block to project an approximately equal distance'on bothsides of'the same, behind adjacent portions of the carrier To release the leaf (i, the screw 9 is'rotatedfin the direction to move forwardly withl the block 7. 1When released the leaf can here`` moved sideways from the block 5.

The opening 16 is made larger than the head 15 for the purpose of enabling a sudden and comparatively powerful impulse or blow to be imparted by the hand-wheel 10, at the end of the rotation thereof in the direction to clamp the work in place, and against the beginning of the rotation thereofin the `direction to release the work, in short, a hammer blow is or maybe imparted by the handwheel at the end ofthe clampingoperation, and again atthe` beginning of the unclamp-V ing operation.

For work of different shapes andsizes, dif ferent clamping blocks lare',required, but otherwise the work holder remains i un@ Uli changed. Usually it-is onlyfthe rear endlof the male clamping blocky and thefadjaeent surface of the female fclampin gbloclcv that have to be changed in-ordentoV accommodated to workof'other shapes andsizee..

In the present case, `the carrieruQiisifprni vided at the bottom with ajsplit sleeve 2Q which is clamped onto the rock shaftf lfby means of two bolts 21. Upon looseningthe bolts 20 the carrier 2 canbe" adjusted vo'nlthe shaft 1, after which said `bolts are. again tightened.

As disposed in the drawings, the work holder is disposed vertically and in operative'position. It is moved intoinoperative positioniby being rocked forwardly or totherightl onithe shaft 1, so that the holder is disposed'atan inclination. When the work holderV is in operative position, the rear end portion 21() of the female clamping block 5 is usuallyreceived in a reciprocating, channeled member, suchas one of the rams in thebroachingfmachineof the aforesaid application, ai fragmentary portion of which is represented: at 22 in Fig. 1.

More or less change in struction, and arrangement of some1 orall of the parts of this work holder, in addition to those` hereinbefore specifically pointed the shape, size, eonlll."

out, may be made, without departing from the spirit of our invention, or exceeding the sco e of what is claimed.v

hat we claim as our invention, and desire to secure by Letters Patent, is-

1. A work holder, of the class described, comprising a carrier having a top, bottom, and sides, and an opening therethrough from front to back, a female clamping block receivable in said opening, said block having a part at the rear end to support the work, and an opening through the sides and front end, means to secure said block in said carrier, a bearing block in said first-named block, and provided with means to hold said bearing block against forward and backward movement, an operating screw in threaded engagement with said bearing block, and a male clamping block in said female clamping block, in front of said work-supporting part, said screw also being in engagement with said male clamping block and adapted when rotated to actuate said male clamping block toward or away from said work-receiving parts.

2. In a work holder, of the class described, a carrier having a top, bottom, and sides, and an opening therethrough from front to back, a female clamping block receivable and adjustable in said opening, and having a part at the front end to support the work, releasable means to secure said block in said carrier, a bearing block in said first-named block, an operating screw in threaded engagement with said bearing block, and a male clamping block in said first-named block back of said work-supporting part, said screw also being in engagement with said male clamping block and adapted when rotated to actuate said male clamping block toward or away from said work-receiving part. y

3. In a work holder, of the class described, a carrier having a top', bottom and sides, and an opening therethrough from front to back, a female clamping block receivable in said opening, having at the rear end a part to support the Work, and opening through the sides and front end, 'means to secure said block in said carrier, a bearing block adapted to be inserted laterally in said clamping block, and provided with means to engage said clamping block to hold said bearing block against endwise movement, an operating screw in threaded engagement with said bearing block, and a male clamping block insertable laterally in said female clamping block, in front of said work-supporting part, both said bearing block and said male clamping block being held against displacement laterally byv said carrier, when said female clamping block is in place therein.

JULIAN L. PERKINS. HIRAM D. oRoFT. 

